用所给单词的适当形式填空.When did she _____ (become) a teacher?

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用所给单词的适当形式填空.When did she _____ (become) a teacher?
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用所给单词的适当形式填空.When did she _____ (become) a teacher?
用所给单词的适当形式填空.When did she _____ (become) a teacher?

用所给单词的适当形式填空.When did she _____ (become) a teacher?
become

前面有did 后面动词用原形

become

become原形,因为前面已经有助动词did 帮助说明是一般过去时了。

become

become 前面有did